your domain name is really important for the success of your website. I have two websites. one is www.Audnow.com, for this domain name, about 20% of the visitor use sign up. but for another website, even with advertise on google, yahoo, and msn, only 0.5% of the people will sign up. this is a big difference. although the contents of the web may also affect why people does not signup, the name of the domain is also a factor.